Error(s) in re-building vignettes:
  ...
--- re-building ‘dm-class-and-basic-operations.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

--- finished re-building ‘dm-class-and-basic-operations.Rmd’

--- re-building ‘dm-filtering.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 79-80 (dm-filtering.Rmd) 
Error: processing vignette 'dm-filtering.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dm-filtering.Rmd’

--- re-building ‘dm-function-naming-logic.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘dm-function-naming-logic.Rmd’

--- re-building ‘dm-good-to-know.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 62-64 (dm-good-to-know.Rmd) 
Error: processing vignette 'dm-good-to-know.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dm-good-to-know.Rmd’

--- re-building ‘dm-introduction-relational-data-models.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 96-100 (dm-introduction-relational-data-models.Rmd) 
Error: processing vignette 'dm-introduction-relational-data-models.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dm-introduction-relational-data-models.Rmd’

--- re-building ‘dm-joining.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.

Attaching package: 'dm'

The following object is masked from 'package:stats':

    filter

── [1mAttaching packages[22m ────────────────────────────────── tidyverse 1.3.0 ──
[32m✔[39m [34mggplot2[39m 3.3.0     [32m✔[39m [34mpurrr  [39m 0.3.4
[32m✔[39m [34mtibble [39m 3.0.0     [32m✔[39m [34mdplyr  [39m 0.8.5
[32m✔[39m [34mtidyr  [39m 1.0.2     [32m✔[39m [34mstringr[39m 1.4.0
[32m✔[39m [34mreadr  [39m 1.3.1     [32m✔[39m [34mforcats[39m 0.5.0
── [1mConflicts[22m ───────────────────────────────────── tidyverse_conflicts() ──
[31m✖[39m [34mdplyr[39m::[32mfilter()[39m masks [34mdm[39m::filter(), [34mstats[39m::filter()
[31m✖[39m [34mdplyr[39m::[32mlag()[39m    masks [34mstats[39m::lag()
Quitting from lines 80-82 (dm-joining.Rmd) 
Error: processing vignette 'dm-joining.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dm-joining.Rmd’

--- re-building ‘dm-low-level.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘dm-low-level.Rmd’

--- re-building ‘dm-setup.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.

Attaching package: 'dm'

The following object is masked from 'package:stats':

    filter

--- finished re-building ‘dm-setup.Rmd’

--- re-building ‘dm-version-migration-guide.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘dm-version-migration-guide.Rmd’

--- re-building ‘dm-visualization.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 49-50 (dm-visualization.Rmd) 
Error: processing vignette 'dm-visualization.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dm-visualization.Rmd’

--- re-building ‘dm-zoom-to-table.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 65-90 (dm-zoom-to-table.Rmd) 
Error: processing vignette 'dm-zoom-to-table.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dm-zoom-to-table.Rmd’

--- re-building ‘dm.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 108-110 (dm.Rmd) 
Error: processing vignette 'dm.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dm.Rmd’

SUMMARY: processing the following files failed:
  ‘dm-filtering.Rmd’ ‘dm-good-to-know.Rmd’
  ‘dm-introduction-relational-data-models.Rmd’ ‘dm-joining.Rmd’
  ‘dm-visualization.Rmd’ ‘dm-zoom-to-table.Rmd’ ‘dm.Rmd’

Error: Vignette re-building failed.
Execution halted